a{
    text-decoration: none;
    color: #223333;
    font-weight: 600;
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    display: block;
}
.Box{
    min-height: 100vh;
    min-width: 100vw;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #222;
}
.loginBox{
    /* background-color: blue; */
    width: 300px;
    height: 350px;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    color: pink;
}

.box{
    width: 200px;
    height: 50px;
    background-color: pink;
    line-height: 50px;
    text-align: center;
    box-sizing: border-box;
    color:#222;
    font-weight: 700;
    position: relative;
    z-index: 2;
    overflow: hidden;  
    cursor: default;
}


.change{
    position: absolute;
    top: -23px;
    left: -260px;
    transform: rotate(45deg);
    width: 350px;
    height: 300px;
    background-color: rgb(250, 233, 234);
    transition: left 1s ;
}
.start{
    position: absolute;
    width: 117px;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
}  

.box:hover >.change{
    left:-59px
}
#username{
    outline: none;
    width: 200px;
    height: 40px;
    border:none;
    display: block;
    box-sizing: border-box;
    margin: 20px;
    text-align: center;
    background-color: rgb(250, 233, 234);;
}
#username:focus {
    box-shadow:  0px 1px 5px 2px  rgba(255,255,255,0.5);
}